Discussion about surgery with Surgeon

HiRSVP​, Im also newly diagnosed but just one step ahead of you. I had my surgery (lumpectomy) two weeks ago and have an appointment with my surgeon tomorrow to see if the margins and lymph nodes are clear. If they are, I will move on to radiotherapy but if not, we’ll be having another discussion about what surgery is next.  
As I said, Im new to this too and can only speak from my own experience. There seems to be a lot they can tell from your biopsy and mammogram as to the size of the affected tissue, what type it is and how aggressive it is. They consider all of this when they make their recommendations but you should definitely question their decision if you’re not comfortable with it. I had the added benefit of an MRI as when my surgeon examined me, she could feel that the affected area seemed to be bigger than the mammogram was showing.  
I was upset and annoyed at the time as I was psyching myself up to having the surgery but having the MRI was going to delay it. Im now so glad I followed her recommendation to have the MRI as she was right about the size. Hopefully, this extra information gave her a clearer target area and I will get the result that the surgery was successful in removing all of the affected tissue.  
I’ll be thinking of you tomorrow and sending good vibes your way. xo